Abstract
In this abstract a low-cost sound level meter is developed with the help of digital signal processing techniques and an integrated programming environment. The instrument is based on the use of a general purpose data acquisition PC card to acquire the signal and a powerful digital signal processing algorithm based on digital filters to compute a one-third octave band analysis conforming to ANSI S1.11-1986 in real time. The objective is made possible thanks to the use of optimized signal processing routines from Intel Signal Processing Library. The use of this library and an instrumentation specific integrated programming environment such as LabWindows/CVI (National Instruments) makes it possible to design a low-cost instrument in a very short time. The algorithm is a multirate filter bank implementation of the standard. The discussion is completed with several simulations and benchmarks are presented for different design situations. Execution time is also compared to that obtained with a popular digital signal processor (TMS820C30 from Texas Instruments). [For Engineering Acoustics Best Student Paper Award.]
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